iMac G5 wont turn on beyond first screen with cranted wheel just spinning on

macrumors newbie

Hi all,
After having inserted a dvd borrowed from the library which my Imac had a really tough time reading, I turned off my Imac as usual. Since then when I turn my mac on the fan starts roaring and i don't get beyond the first white screen with the sort of clocked wheel just going round and round. I don't have a clue to what to do. Thanks for any help.

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